柴达木盆地西部地区新生代沉积与构造演化  

Cenozoic Sediments and Tectonic Evolution in the Western Qaidam Basin

作　　者：方向[1] 张永庶[2] 

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]青海油田公司勘探开发研究院,甘肃敦煌736202

出　　处：《地质与勘探》2014年第1期28-36,共9页Geology and Exploration

摘　　要：新生代柴西地区南北变形具有很好的对称性,盆地边缘发育高角度逆冲断层,古近纪时期库木库里和苏干湖盆地与柴达木盆地相连,据此认为柴西地区是地壳纵弯褶皱的机制下形成的新生代向斜沉降区。其构造演化经历了古新世-渐新世早期纵弯褶皱形成、晚渐新世-中新世纵弯褶皱发展和晚期盆内断褶构造强烈活动三个阶段,控制了相应时期的沉积边界和沉积相分布。古近纪时期库木库里盆地和苏干湖盆地是柴达木盆地的一部分,新近纪以来,由于盆缘逆冲断层的活动,库木库里和苏干湖盆地逐步与柴达木盆地分割开来。据此认为盆地中部一里坪地区和盆地边缘的油气勘探有较大潜力。It is suggested that the Qaidam basin was generated as a result of longitudinal buckling of crust, manifesting itself as a synclinal depression in Cenozoic. There is similiar deformation on the south and north parts of the basin, and exist major high-angle reverse faults at basin margins. In Paleu- gene, this basin linked with the adjacent intermontain Suhai and Kumukol basins. The western Qaidam basin experienced three distinct tectonic evolution stages： formation of crustal folds in the Paleocene-early Oligocene, further development of the folds during the late Oligocene to the Middle Miocene, and intense activity of fault-fold structure in later time. The deposit boundaries and sedimentary facies were controlled by every structural stage correspondingly. And both of the Suhai basin and Kumukol basin were part of the Qaidam basin during the Paleogene, which were subsequently isolated from the Qaidam basin due to basinward thrusting at basin-margin areas. The Liping area in the center and the margin areas of the basin are considered with major potential of oil and gas exploration.

关 键 词：柴西地区 新生代 构造 纵弯褶皱 

分 类 号：TE122[石油与天然气工程—油气勘探]